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Question1
A 25MW Jet engine produces a sound level of 120dB, threshold of pain at a distance of 100m from the engine Recall the threshold of human hearing is 1 * 10^(-12)W/m^2
a)What portion of jet power is lost to producing this sound?
b) You are at your silent summer house (40dB) and you can just hear the sound of the smae jet engine at the airport. How far away is your house from the airport?
c) Is result of your simple calculation reasonable?
Question2
Powdered steel is placed in a container filled with oxygen and fitted with a piston that moves to keep the pressure in a container constant at one atmosphere. A chemical reaction occurs that produces heat. To keep contents at a constant temperature of 28.7oC, it is needed to remove 5.51083 × 10^5J of heat from container as it contracts. During the chemical reaction, it is found that 1.8 mol of oxygen is consumed. Find the internal energy change for the system of iron and oxygen. The universal gas constant is 8.31451 J/K mol.
Five moles of an ideal monatomic gas with an initial temperature of 128 C expand and, in the process, evaluate the final temperature of the gas
You are riding on a Jet Ski at some angle upstream on a river flowing with a speed of 2.8. Assume the Jet Ski is moving at a speed of 12 relative to the water. At what angle should you point the Jet Ski if your velocity relative to the ground is t..
Two objects attract each other gravitationally with a force of 3.0×10-10 N when they are 0.60 m apart. Their total mass is 4.0 kg. Determine their individual masses.
A loaded ore car has a mass of 935 kg and rolls on rails with negligible friction. What maximum power must the winch motor provide
Suppose a small boat is at the crest of this wave, 1.5 {rm m} above the equilibrium position. Illustrate what will the vertical position of the boat be 5 seconds later?
An elevator is able to raise 9,800 N to a height of 37 m in 12 s, What is the elevator's power output and How much work does the elevator do
A 11.0g bullet is fired horizontally into a 103g wooden block that is firstly at rest on a frictionless horizontal surface and connected to a spring of constant 154N/m. The bullet becomes embedded in block. If the bullet-block system compresses the s..
What is the velocity of q_{2} when the balls are 0.450 m apart. what is the speed that the bar falls.
The figure below shows a mercury barometer. Consider two barometers, one using mercury and another using an unknown liquid. estimate the density of the unknown liquid
For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air. determine the recoil velocity
A block of mass m = 331 g is dragged with a string across a rough horizontal table. The string tension is T = 3.27 N, What is the power supplied by the force of friction
A member of an aircraft maintence crew wears protective earplugs that reduce the sound intensity by a factor of 350. What sound intensity level would the crew member experience
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